High Energy Physics

CLEO

The CLEO-III trigger system (designed and built by the University of Illinois at Urbana-Champaign) is still working
extremely well. As luminosity is integrated and diagnostics are honed, we are
uncovering only very minor problems.

The test system used to evaluate over six hundred tile daughter boards was cobbled together from a
mix of NIM and CAMAC electronics, and run by a DEC microVax 3600. Built in part in 1988 with funds from
the University of Illinois Research Board, we have assembled a modern test facility based on PCI-bus
instrumentation installed in a PC, which runs LabVIEW. The LabVIEW system runs a pair of newly designed
circuit boards which generate test pulses and provide services for daughter boards under test, and then
route selected signals to the PCI instrumentation for digitization and analysis. The old system required
twenty minutes to test one board; our estimates are that the new system will only need a few minutes to
perform considerably more detailed tests of each board. LabVIEW-based analysis software for the new test
facility is under construction.

We use the CLEO detector at CESR to study the properties of thetau lepton and of particles containing
the b and c quarks. These studies allow us to perform stringent tests of the standard model of particle
physics. We are working on a silicon microstrip vertex detector which will give 0.1 psec time resolution
for particle lifetimes. This will significantly enhance the experiment's sensitivity to new physics.

Other CLEO Links

This material is based upon work supported by the Department of Energy under Grant Numbers 64377, 56840, 80780, 561096,
DEFG02-03ER41281 and DEFG02-91ER40677. This material is also based on work supported by the National
Science Foundation under Grant Numbers PHY03-49179 and PHY04-26272. Any opinions, findings, and conclusions or recommendations
expressed in this material are those of the author(s) and do not necessarily reflect the views of the Department of Energy or
National Science Foundation.